Button-hole cutter for sewing-machines



(No Model.)

F. E. SCHMIDT.

BUTTON HOLE CUTTER FOR SEWING MACHINES. No. 369,473. Patented Sept. 6, 1887.

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WlTNES E1 E5 N PETERS. Pmmmnm Washington. D. C.

UNITED STATES PATENT OFFICE.

FRIEDRICH E. SCHMIDT, OF BROOKLYN, NEW? YORK.

BUTTON-HOLE. CUTTER FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 369,473, dated September 6, 1887.

Application filed October 20, 1886. Serial No. 216,706. (No model.)

To all whom it may concern.-

Be it known th at I, FRIEDRICH E. SCHMIDT, of the city of Brooklyn, county of Kings, and State of New York, have invented a new and Improved Gutter for Button-Hole Sewing-Machines, of which the following specification is a full, clear, and exact description.

This invention relates to an improved device for cutting or punching the button-hole through the cloth before the latter is exposed to the action of the needle. The cutter is composed of two levers pivotally connected to the bed-plate of a button-hole sewing-machine, and operated by a link and also by means of a cam bearing against the rear ends of the levers.

The invention consists in the various features of improvement hereinafter more fully pointed out.

In the accompanying drawings, Figure 1 is a sectional side view of my improved cutter, showing the same opened. Fig. 2 is a similar view, showing it closed. Fig. 3 is a bottom view of the upper cutting-die, and Fig. 4: is a top view of the lower cutting-die. Fig. 5 is a front view of the link or yoke 76.

The letter a represents the bed-plate of a button-hole sewing machine, beneath which there is hung, in suitable bearings, a transverse shaft, 2). To this shaft there is secured a cam, c, as shown.

(I is the curved upper lever that carries outting-die c, and has trunnion f, free to slide vertically in bearingposts g, projecting upwardly from bed-plate a.

h is the lower lever, carrying cutting-die z, and pivoted to a lug, j, projecting downward from plate a.

The levers cl h have rearward extensions or tail-pieces, d h, against which the cam 0 cperates. The lever cl is embraced by a yoke or link, 7t, pivoted at its lower end to lug j or other suitable support, and having an upper roller or pin, Z, and a lower roller or pin, in, between which pins the lever is introduced. The link It is connected by an arm, n, to a disk or arm, 0, secured to shaft 1) in such a manner that by rocking the shaft backward and forward a corresponding motion will be imparted to the link.

The operation of the parts is as follows:

The cutter being opened as in Fig. 1, the shaft 1) is rocked forward by a handle, 19. This will cause the link 70 to be swung forward by arm a, and the link in turn will, with its upper pin, 1, bear upon lever 01 and force the same down. 'When the link It is in an upright or nearly upright position, it will fall into a notch, q, of lever (Z, and its farther forward motion will cease. The dies 0 i are now brought close above one another without being forced together. On afarther forward revolution of shaft 1) the cam 0 will bear against the tail-pieces d It of the levers d h, and thereby forcibly press the dies together to punch the button-hole out of the piece of interposed cloth. The shaft 1) is now rocked backward by handle 11 to permit a pair of springs, r s, secured to levers (1h, to slightly press them apart. \Vhen the shaft has been rocked backward to a certain distance, the link it will, by arm a, be drawn backward. The lower pin, m, of the link, engaging the lower side of lever d, will now raise such lever until it arrives at its most upright position.

I claim as my invention 1. In a button-hole sewing-machine, the combination of a pair of levers carrying the cutting-dies, with alink whose lower extremity is pivoted to the bed of the machine and whose upper extremity loosely engages the upper lever, and means for vibrating the said link upon its pivotal point, and a cam acting upon both levers, all being so constructed that the link andthe cam operate successively to cause an approach of the dies, substantially as specified.

2. The combination, in a button-hole sewing-niachine, of a pair of levers carrying the cutting-dies and pivoted to suitable supports, with an oscillating link or yoke, whose lower extremity is pivoted to the bed of the machine and whose upper extremity loosely engages the upper lever, and means for vibrating the said link upon its pivotal point, and a cam placed between the levers and bearing upon rearward extensions of the same, substantially as specified.

8. The combination, in a button-hole sew ingqnachine, of a pair of levers carrying the cutting-dies, with a link whose lower extremity lug-machine, of an upper curved and notched lever having a sliding bearing and carrying a :0 cutting-die, with alower lever carrying a cutting-die,and with alink whose lower extremity is pivoted to the bed of the machine and whose upper extremity loosely engages the upper lever, and means for vibrating the said link upon its pivotal point, and with a cam engag- 15 ing both levers, substantially as specified. F. E. SCHMIDT. Witnesses:

F. v. BRIESEN, R0121. I-I. R Y.

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